<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript" src='../../jQuery/jquery-3.4.1.js'></script>
		<script type="text/javascript">
			
			$(function(){
				$("#btn").click(function(){
					alert("绿叶学习网jQuery入门教程");
				})
				$("#btnOff").click(function(){
					$("#btn").off("click");
				})
				
			})
		</script>
	</head>
	<body>
		<input id="btn" type="button" value="按钮"/>
		<br>
		<br>
		<input id="btnOff" type="button" value="解绑事件"/>
		
	</body>
</html>
